a single wound steel cable makes the perimeter, metal end pieces at each corner to fasten to. Nice and heavy material Really liked the quality and feel of the product felt very high quality and very solid.Purchased 20x20x20,just put it up temporary so you can have an idea of what it looks like,had to buy the inslations kits to hang it up. I am going to buy the poles which are 14 feet high, four of the feet will be underground for support fabricated from high grade extra heavy HDPE cloth specially designed to breathe and keep you cooler and more comfortable in hot weather. It can block harmful sun rays yet remains totally unaffected by moisture and nature temperature extremes.I will definitely recommend it. Installation Hardware/Kit
Posts are not included I wish it did.I Tried it out for awhile now and it leeks in rainy weather.
Kathy True& Tried Program